Degradation Mechanism of Amorphous Silicon Carbide Fiber due to Air-Exposure at High Temperatures

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The degradation mechanism of the amorphous silicon carbide fiber, Tyranno-ZMI<SUP>®</SUP>, exposed in air at 1173∼1873 K for 20 ks were studied. The average strength of the bare fiber, which was prepared by etching away the oxidation layer on the fiber surface, decreased with increasing exposure temperature, especially when exposed at the temperature higher than 1673 K. The measurement of the crystallite size of β-SiC in the fiber with Sherrer method revealed that coarsening of the crystalline occurred in the fiber exposed at the temperatures higher than 1773 K. The scanning electron microscope observation of the fiber surface showed that the many defects formed on the fiber surface. By introducing an artificial notch directly into the fiber specimens using a focused-ion(Ga<SUP>+</SUP>)-beam, the fracture toughness values of the as-supplied fiber and of the fiber exposed at 1673 and 1773 K were determined to be 1.8±0.3, 1.9±0.4 and 1.3±0.4 MPa\sqrtm, respectively. Based on these results, the reason for the degradation of the fiber was attributed to the extension of the surface defect which was enhanced by the reduction in fracture toughness due to coarsening of the β-SiC crystalline.

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  • Materials transactions  

    Materials transactions 48(2), 111-116, 2007-02-01 

    The Japan Institute of Metals and Materials

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各種コード

  • NII論文ID(NAID)
    10018508426
  • NII書誌ID(NCID)
    AA1151294X
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13459678
  • NDL 記事登録ID
    8623498
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z53-J286
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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